Messages in this thread | | | From | Thomas Gleixner <> | Subject | Re: [RFC-PATCH 1/2] mm: Add __GFP_NO_LOCKS flag | Date | Tue, 18 Aug 2020 16:43:14 +0200 |
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On Tue, Aug 18 2020 at 06:53, Paul E. McKenney wrote: > On Tue, Aug 18, 2020 at 09:43:44AM +0200, Michal Hocko wrote: >> Thomas had a good point that it doesn't really make much sense to >> optimize for flooders because that just makes them more effective. > > The point is not to make the flooders go faster, but rather for the > system to be robust in the face of flooders. Robust as in harder for > a flooder to OOM the system. > > And reducing the number of post-grace-period cache misses makes it > easier for the callback-invocation-time memory freeing to keep up with > the flooder, thus avoiding (or at least delaying) the OOM.
Throttling the flooder is incresing robustness far more than reducing cache misses.
Thanks,
tglx
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